Names used by others: "Big Boss", "Snake" Real name: John (Jack) Likes Cigars, cardboard boxes Personality Basically a cool and composed individual, but at heart, he is very compassionate toward his comrades and has a kind, emotional side. While he can be bright, unique, and playful—sometimes cracking jokes—he also has a side that is airheaded, dense, and gluttonous. He doesn't hesitate to put his own life on the line for those he recognizes as allies. He has no hesitation when the time comes, but even with enemies, he generally does not like killing.

Real name: Adamska Former CIA, former Spetsnaz, former GRU Ocelot Unit commander. Known by the alias Shalashaska. Diamond Dogs Strategist Likes SAA, Spaghetti Westerns Personality An expert in marksmanship and interrogation who wears a duster coat and loves Spaghetti Westerns, including spurred boots and the SAA. Regarding shooting in particular, he boasts that he "understands the bullet's feelings," possessing high-level skills such as manipulating ricochets and specializing in fanning shots. He continues to use the SAA as the "greatest handgun ever made." He is also a professional and enthusiast of interrogation. He worships Naked Snake.

Nickname: Kaz Half-Japanese, half-American Diamond Dogs Second-in-Command Personality Contrary to his tough appearance with blond hair and sunglasses, he has a very lighthearted and frank personality. He is compassionate and full of humor. He often introduces strange things developed by the R&D team to Big Boss just to see his reaction. He was bewildered when the Cardboard Tank was liked more than expected, wondering if he was the one who was crazy. As Snake's right-hand man, he possesses not only combat ability but also broad and deep knowledge. He is particularly well-versed in various military-related information, past conflicts, and political backgrounds. He is a womanizer and once got into a fistfight in a sauna after being scolded by Big Boss.

Names used by others: "Boss" Naked Snake's body double Only Venom has a prosthetic left arm Likes Electronic cigars (Phantom Cigars) Personality Though a man of few words, he is very compassionate toward his comrades. Because he cares for his allies at Mother Base and the soldiers he rescues on the battlefield, he is highly respected and admired as a leader by many soldiers at Mother Base, many of whom joined specifically to follow him.